A meniscal tear is a tear that occurs in the cartilage of the knee. The meniscus is a small, "C" shaped piece of cartilage in the knee joint. Each knee has two menisci, the medial meniscus on the inner aspect of the knee and the lateral meniscus on the outer aspect of the knee. The medial and lateral menisci act as a cushion between the thigh bone (femur) and shin bone (tibia). Meniscal tears are one of the most common injuries to the knee joint. They can occur at any age, but are more common in athletes playing contact sports.